package com.ny.wlw;

import java.sql.*;
import java.util.Scanner;

public class LoginDemo {

        private static  final  String URL="jdbc:mysql://localhost:3306/usersdb";
        private  static  final  String DB_username="root";
        private  static  final  String DB_password="123456";

        public static void main(String[] args) throws ClassNotFoundException, SQLException {
            Class.forName("com.mysql.cj.jdbc.Driver");
            Connection connection = DriverManager.getConnection(URL,DB_username,DB_password);
            String sql ="select * from userdb where username =? and password=?";
            PreparedStatement preparedStatement = connection.prepareStatement(sql);
            Scanner scanner=new Scanner(System.in);
            System.out.println("请输入用户名");
            String username = scanner.next();
            System.out.println("请输入密码");
            String password = scanner.next();
            preparedStatement.setString(1,username);
            preparedStatement.setString(2,password);
            ResultSet resultSet =preparedStatement.executeQuery();

            if (resultSet.next()){
                System.out.println("登陆成功");
            }
            else {
                System.out.println("登录失败");
            }
        }
    }

